In his feature-length documentary, humorist and New Orleans resident Harry Shearer gets the inside story of a disaster that could have been prevented from the people who were there. Shearer speaks to the tireless investigators and experts who poked through the muck as the water receded, and uncovers a courageous whistle-blower from the Army Corps of Engineers. His dogged pursuit of facts reveals that some of the same flawed methods responsible for levee failure during Hurricane Katrina are being used to rebuild the system expected to protect the "new" New Orleans from future peril.